| 21. | They are termed lanthanide because the lighter elements in the series are chemically similar to lanthanum.
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| 22. | The lanthanum plutonium oxide was next collected and extracted with nitric acid to form plutonium nitrate.
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| 23. | Three group 3 elements occur naturally, scandium, yttrium, and either lanthanum or lutetium.
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| 24. | In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium.
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| 25. | Lanthanum-140 is a decay product of barium-140, a common fission product.
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| 26. | A more sensitive test uses lanthanum nitrate with iodine and ammonia to give a blue solution.
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| 27. | Leitz laboratories discovered that lanthanum ( III ) oxide can be a suitable thorium dioxide replacement.
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| 28. | These elements are vanadium, rubidium, indium, lanthanum, europium, rhenium and lutetium.
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| 29. | Of all the rare-earth sulfides, lanthanum gives the largest range of vitreous compositions.
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| 30. | 9 . Optical Band gap on wurtzite Zinc Sulphide nanocrystallites doped with lanthanum ions ( Proce.
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